What Lily Carter wants most in the world is to attend Princeton University. She's thrilled when she visits the campus and her alumnus grandfather tells her she'll gain automatic acceptance if she passes the top-secret Legacy Test by finding the Ivy Key. But as she searches, she learns there are two Princetons--an ordinary one and a magical one. When Lily enters the magical Princeton, she uncovers old betrayals and new dangers, and a chance at her dream becomes a fight for her life. Soon Lily is caught in a power struggle between two worlds, with her family at its center. In a place where knights slay monsters, boys are were-tigers, and dragons might be out for blood, Lily will need all of her ingenuity and courage--and a little magic--to unite the worlds and unlock the secrets of her past and her future.